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Audrey had some $10 notes and Sean had some $20 notes.

The ratio of the number of Audrey's notes to the number of Sean's notes was 4 : 3.

After Audrey gave Sean 16 notes, this ratio became 2 : 5.

(a) How many $20 notes did Sean have at first?

(b) Find the total value of all the notes which Sean and Audrey had.

Notes to students:

If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12